METHOD OF PRODUCTION OF FIBROUS HALF-FINISHED PRODUCT

摘要

FIELD: production of fibrous half-finished products at different degree of delignification; wood-pulp and paper industry. ^ SUBSTANCE: cellulose-containing vegetable material is subjected to boiling at higher sulfidity of boiling solution, up to 100%. Used as sulfide-containing component are alkaline wastes of oil desulfurization processes which contain inorganic compounds, including sodium sulfide at concentration up to 120 g/l in Na2O terms and residual organic compounds in form of sulfur-containing hydrocarbons C5-C6 and phenolates at concentration up to 15 g/l. Boiling is carried out at 130-160°C. ^ EFFECT: high parameters of delignification process; enhanced economical efficiency; reduction of toxic emissions. ^ 2 tbl